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Implications of MPLS Interconnect in Network Engineering: Challenges and Solutions

This document explores the implications of MPLS interconnectivity as experienced by Cable and Wireless (C&W) in January 2005. It discusses the number of direct and indirect connections to other carrier MPLS networks, primarily in the EU, and highlights the transparent Class of Service provided. Key challenges identified include digital wrapper complexities, control plane security risks, OAM issues, and QoS inconsistencies. However, C&W has reported no significant security or integrity issues to date and expresses confidence in finding solutions through expertise and discussions.

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Implications of MPLS Interconnect in Network Engineering: Challenges and Solutions

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  1. MPLS Interconnect- Implications Network Engineering – January 2005

  2. C&W MPLS Network IC – Scope • Direct NNIs with other carrier MPLS networks in ‘double figures’ • Similar number of indirect connections to direct ones • Mostly in EU • Significant number of additional ones in pipeline • Transparent Class of Service (ie honour customer’s CoS/TOS bits) • To date C&W have experienced no significant security or integrity problems © 2005 Cable and Wireless plc

  3. MPLS Interconnect – BT ‘Challenges’ • Digital Wrapper – Labels within Labels • C&W does not employ label stacking across NNI, hence no issue • Control Plane Challenge – control plane runs in-band allowing IP across NNI = security risk • C&W does not permit native IP across NNI (Option B RSC2547 S.10) • OAM challenge – requires protocols allowing identification of which operators network is at fault • C&W does not allow access to PE routers; provides proxy servers which give visibility of relevant configuration information • QoS Challenge – QoS not consistent across network and degenerates to lowest common denominator • Solution requires mapping of code point marking © 2005 Cable and Wireless plc

  4. Summary • This response is not based on detailed study! • C&W MPLS interconnect experience to date has not been problematical from a security/integrity viewpoint • Agree that there are challenges to be met, but confident that there are solutions to the issues raised • C&W SMEs will participate in detailed discussions in due course (TSG?) © 2005 Cable and Wireless plc

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